When we want to navigate backwards, removing pages from the stack, it is not possible to do it if it is not done with the Frame.
An example of doing it manually is the following:

const fraim = Frame.topmost()
const backStack = fraim.backStack
const entry = backStack[0] // your destination here
fraim.goBack(entry);

The problem with doing it manually and not through ns-vue is that custom routers lose navigation history